Union Technique Cinematographique S.A. (UTC)

Fabienne believes herself to be cheated on by her husband Claude and divorces her. He leaves for America and does not return until eight years later. He then meets his daughter.

A legend about the Malveneur family tells of how their ancestor sold his soul to the devil and was cursed: man by day, wolf by night. The last of the Malveneurs is a scientist who carries out strange experiments on... nobody knows exactly what the does in the underground. The wife has a heart condition, her sister-in-law is a authoritarian lady. And nights in the old castle are not exactly peaceful.

Sophie de Réan, an unruly mischievous little girl grows up under the thumb of Mademoiselle, her strict governess. Following her mother's death, she is entrusted to Mme de Fleurville, her aunt, who at the same time hires Mademoiselle to further Sophie's education. A few years later, the little girl has blossomed into a lovely young lady. She is now in love with Paul, her cousin, who, unlike her, used to be a model child. Unfortunately Mademoiselle will not hear of a union between them. Instead she wants Sophie to marry Armand, the conceited son of Prefect Hugon. To make matters worse, Paul, the good boy, unexpectedly turns into a revolutionary, who defends the Republic on the barricades against Louis Napoléon's coup. Not being one of the victors, Paul is forced into exile. Will Sophie finally yield and accept the established order or will she react in her usual rebellious way and follow the one she loves ?